VVVVVV is a 2D platform game.
Unlike other platform game you cannot jump but only invert the gravity.
Graphics and music are heavily inspired by the Commodore C64 era.

The Make and Play Edition (games/vvvvvv@makeandplay) is a completely
free, official version of VVVVVV that includes player levels, and the
tools to create levels of your own! It does not include the original
levels from the game.